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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Bah! Kenjo, Niinuma. Stepping motors and their microprocessor controls P96, Clarendon Press (Oxford) 1983 could unwravel the poles/phases ... take one apart and see if there are 34 teeth.
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
radiotech wrote ...
Bah! Kenjo, Niinuma. Stepping motors and their microprocessor controls P96, Clarendon Press (Oxford) 1983 could unwravel the poles/phases ... take one apart and see if there are 34 teeth.
That's still 408 steps for almost 360 degress. But not exact.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I use one of those to fine adjust my frequency generator. Just add two comparators/op-amps and it will generate a clean signal no matter how slow you turn it. A rotary encoder of similar quality will cost a fortune and easily be the most expensive part in a project.
stepper motor as an encoder? that sounds like a great trick! if you make a quick writeup about it you will probably get it on hackaday, plus its a nifty idea
the step angle measured changes from + odd step - even step as the motor completes a revolution. What they write on the nameplate must refer back to a standard for steppers. Perhaps it factors in error.
The motor has to get the head close enough for the data to read.. The old drives used to have a tweak to get them to read track0 properly
The 8 inch old drives were sought by amateur astronomers to build polar drives.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
By chance I took a picture before mounting it in place, there are no wires on the backside so the whole circuit should be fairly clear. My plan was to use a comparator but I must have gotten the wrong part out of the box since that is an operational amplifier.
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0.882 degree/step stepper motors...
